Вывод bitmap под углом - C++ WinAPI - Ответ 6835316

// Добавить альфа канал в BMP
// Описание формата BMP: [url]http://ru.wikipedia.org/wiki/BMP[/url]
 
 
#include <stdio.h>
#include <windows.h>
 
 struct pixel_rgba
 {
  public:
   BYTE b;
   BYTE g;
   BYTE r;
   BYTE a;
 };
 
 struct pixel_rgb
 {
  public:
   BYTE b;
   BYTE g;
   BYTE r;
 };
 
 
int main()
{
BITMAPFILEHEADER bmp_header;
BITMAPINFOHEADER info_header;
int i;
unsigned char y;
 
FILE *f;
FILE *g;
f = fopen("wood_100x100.bmp", "rb");
g = fopen("wood_100x100rgba.bmp", "wb");
fseek(f, 0 , SEEK_SET);
// SEEK_SET на начало файла
// SEEK_CUR текущая позиция
fread(&bmp_header, 1, sizeof(BITMAPFILEHEADER), f);
printf("sizeof(BITMAPFILEHEADER) : %x %d\n",
sizeof(BITMAPFILEHEADER), sizeof(BITMAPFILEHEADER));
fseek(g, 0 , SEEK_SET);
fwrite(&bmp_header, 1, sizeof(BITMAPFILEHEADER), g);
 
 
 
 
int dr = bmp_header.bfOffBits - sizeof(BITMAPFILEHEADER);
printf("dr: %d\n", dr);
 
if (dr == 40)
{
fseek(g, sizeof(BITMAPFILEHEADER), SEEK_SET);
fread(&info_header, 1, sizeof(BITMAPINFOHEADER), f);
 
  info_header.biSize = sizeof(BITMAPINFOHEADER);
  printf("info_header.biSize: %x\n", info_header.biSize);
  printf("info_header.biWidth: %d\n", info_header.biWidth);
  printf("info_header.biHeight: %d\n", info_header.biHeight);
  printf("info_header.biPlanes: %d\n", info_header.biPlanes);
  printf("info_header.biBitCount: %d\n", info_header.biBitCount);
  printf("info_header.biCompression: %d\n", info_header.biCompression);
  printf("info_header.biSizeImage: %d\n", info_header.biSizeImage);
  printf("info_header.biXPelsPerMeter: %d\n", info_header.biXPelsPerMeter);
  printf("info_header.biYPelsPerMeter: %d\n", info_header.biYPelsPerMeter);
  printf("info_header.biClrUsed: %d\n", info_header.biClrUsed);
  printf("info_header.biClrImportant: %d\n", info_header.biClrImportant);
 
info_header.biBitCount = 32;
 
fseek(g, sizeof(BITMAPFILEHEADER) , SEEK_SET);
fwrite(&info_header, 1, sizeof(BITMAPINFOHEADER), g);
 
}
 
printf("bmp_header.bfType: %x\n", bmp_header.bfType);
printf("bmp_header.bfSize: %x\n", bmp_header.bfSize);
printf("bmp_header.bfReserved1: %x\n", bmp_header.bfReserved1);
printf("bmp_header.bfReserved2: %x\n", bmp_header.bfReserved2);
printf("bmp_header.bfOffBits: %x\n", bmp_header.bfOffBits);
 
printf("sizeof(BITMAPFILEHEADER) : %x %d\n", sizeof(BITMAPFILEHEADER), sizeof(BITMAPFILEHEADER));
printf("sizeof(BITMAPV4HEADER) : %x %d\n", sizeof(BITMAPV4HEADER), sizeof(BITMAPV4HEADER));
printf("sizeof(BITMAPV5HEADER) : %x %d\n", sizeof(BITMAPV5HEADER), sizeof(BITMAPV5HEADER));
 
 
// перебор пикселей изображения
int offset;
int offset2;
int j = 0;
int h = sizeof(pixel_rgb);
printf("sizeof(pixel_rgb) : %x %d\n", sizeof(pixel_rgb), sizeof(pixel_rgb));
pixel_rgb rt;
pixel_rgba rt2;
// условие остановки
while(bmp_header.bfOffBits +  j * sizeof(pixel_rgb) < bmp_header.bfSize)
{
offset =  bmp_header.bfOffBits +  j * sizeof(pixel_rgb);
offset2 =  bmp_header.bfOffBits +  j * sizeof(pixel_rgba);
fseek(f, offset , SEEK_SET);
fread(&rt, 1, sizeof(pixel_rgb), f);
rt2.b = rt.b;
rt2.g = rt.g;
rt2.r = rt.r;
if (rt.b == 255 && rt.g == 255 && rt.r == 255)
 rt2.a = 255;
else
 rt2.a = 0;
 
printf("%x %x %x ",  rt.b,  rt.g,  rt.r);
 
fseek(g, offset2 , SEEK_SET);
fwrite(&rt2, 1, sizeof(pixel_rgba), g);
 
j++;
}
 
fclose(f);
fclose(g);
 
return 0;
}